import java.math.BigDecimal;

public class Calculadora {
 
public BigDecimal somar(BigDecimal param1, BigDecimal param2) throws Exception{
return null;
}
 
public BigDecimal subtrair(BigDecimal param1, BigDecimal param2) throws Exception{
return null;
}

public BigDecimal multiplicarx(BigDecimal param1, BigDecimal param2) throws Exception{
return null;
}
 
public BigDecimal multiplicar(BigDecimal param1, BigDecimal param2) throws Exception{
return null;
}
 
public BigDecimal dividir(BigDecimal param1, BigDecimal param2) throws Exception{
return null;
}
}